32
Installation
Installation and Programming Manual
3-5-5
Double Zone balancing with EOL
Double zones with EOL resistors can discriminate 6 conditions on the
entire terminal:
•
standby on both zones
•
alarm on zone 1 and standby on zone 2
•
alarm on zone 2 and standby on zone 1
•
alarm on both zones
•
tamper (wire cutting)
•
tamper (short-circuit)
For each of these, the control panel reads different resistance values on
the terminal, expressed below in Ohm.
3-6
Wiring and balancing
rollerblind/shock sensors
It is possible to choose between two types of balancing for Rollerblind and Shock
sensors:
•
Normally Closed (N.C.)
•
Single balancing (NC with EOL)
The following table compares the protection level of rollerblind/shock sensors
using the two balancing options provided by the control panel.
If the rollerblind or shock sensor is connected to a terminal of a wireless device,
the connection cable must be less than 2 meters long.
The rollerblind sensor must generate pulses with a length of between 500
m
sec
and 10msec.
3-6-1
Normally Closed (N.C.)
In this case, the alarm condition is revealed exclusively by the number of pulses
(pulse count) the control panel detects on the terminal.
If this balancing method is applied, the control panel will be unable to detect
tamper, wire-cutting or short-circuit.
The discriminated conditions are:
•
standby
•
alarm
The alarm condition is triggered by the number of pulses and sensitivity, in
accordance with the programmed parameters (refer to paragraph
6-6 Zones -
Detector type
).
W
Zone 1
Zone 2
(double)
> 2 x 3900 + 6800
tamper (wire cutting)
> 2 x 3900 + 6800
alarm
alarm
3900 + 6800
standby
alarm
2 x 3900
alarm
standby
3900
standby
standby
0
tamper (short-circuit)
Alarm
+12V GND
Tampe
r
Alarm
+12V GND
Tamper
3K9
W
W
1/4W
6K8
W
1/4W
Zone 1
Zone 2
Table 27:
Protection level
BALANCING
N.C.
Single balancing
(N.C. with EOL)
Rollerblind
or Shock
very low
high
